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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.12: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Dry-transfer process of graphene / hBN heterostructures — •Khairi Fahad Elyas, Asem Ben Kalefa, Lina Bockhorn, Gunnar Schneider, Christopher Belke, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover

Graphene is the first in a large family of two-dimensional (2D) van der Waals (vdW) materials to attract a lot of attention due to its remarkable properties. One of these properties is a zero band gap. The second most popular vdW material after graphene is hexagonal boron nitride (h-BN). The h-BN is a ideal insulator with wide band gap (4.5 eV).
Here, we demonstrate the dry-release transfer of monolayer and bilayer graphene of the size up to 20 µm by using poly (propylene) carbonate (PPC) films. We also transfer a few layers h-BN with size up to 45 µm. Due to the strong adhesion between PPC and 2D materials at room temperature, we show that single-layer to low-layer graphene as well as less-layered h-BN can be produced on a spin coated PPC films /SiO₂ / Si substrate by the mechanical peeling method. This method is useful for sample preparations for different applications like TEM measurements. Based on the dry-release transfer samples with high purities are achieved.
We also demonstrate electronic and magnetotransport measurements on graphene/hBN heterostructures.